Tax disclosure has become increasingly important for the stakeholders of public interest entities. The heterogeneity of tax disclosure in financial and sustainability reporting leaves open questions about the (non-) integration of tax and sustainability reporting. This article aims to explore the components of tax-related sustainability reporting (TRSR) and its derivation from existing reporting standards. Based on legitimacy and stakeholder (agency) theories, the authors stress the need for regulation of TRSR from a European perspective and introduce an innovative reporting concept.